Air-pump for pneumatic tires.



No. 677,7I0. Patented July 2, l90l. G. B. STACY.

AIR PUMP FOB PNEUMATIC TIRES.

(Application led Nov. 13, 1900.)

(No Model.)

NVENTOH F @606579,51 ,'acg

i BY

TTOWEYS GEORGE BLAIR STAOY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO`ALEXANDER H. SPENCER, OF NElV YORK, N. Y.

A|R-PUIV|P FORY PNEUMATIC TIRES.

- SPECIFICATION forming' part 0f Letters Patent NO. 677,710, dated July2, 1901.

Application led November 18, 1900. Serial No. 36,35 7. (No model.)

To all whom, t mctyconcern.-

Be it known that I, GEORGE BLAIR STAGY, a citizen of the United States,and a resident of Boston, in the county of Suffolk and State ofMassachusetts, have invented a new and Improved Air-Pu mp for PneumaticTires, of which the following is a full, clear, and exact description.

The invention relates to air-pumps automatically operated by motionderived from displacement of the tire under pressure.

The object of the invention is to provide a new and improved air-pumpfor pneumatic tires which is simple and durable in construction, veryeffective in operation, arranged to avoid leakage, and insure pumping ofa sut'- iicient quantity of air into the tireto keep the tire iniiatedin case of a puncture or other leakage and while the vehicle is in use.

The invention consists of novel features and parts and combinations ofthe same, as

will be fully described hereinafter and then pointed ont in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a side elevation of the improve'- ment as applied, the tireand rim being shown in section. Fig. 2 is a transverse section of thesame on the line 22 in Fig. l. Fig. 3 is a similar view of the same withthe parts in a different position. Fig. 4 is an enlarged sectional sideelevation of the upper end of the barrel, t-he end having thesuction-valve. Fig. 5 is an inverted plan View of the barrelhead andsuction-valve. Fig. Gis an enlarged sectional plan View of the barrel,the section being on the line 6 6 in Fig. 3. Fig. 7 is an enlargedsectional side elevation of part of the plunger and stem, and Fig. 8 isa sectional .I

' ger through port-s a into the interior of the plan view of the same.

The cylinder or barrel A of the air-pump is provided with an outer headB, containing a suction-valve O, and on the inner end of said barrel issecured an inner head D, screwing 'on an externally-threaded sleeve E,fastened to the tire F at the rim G, as is plainly indicated in thedrawings. The inner end of the sleeve E is formed with a flange E',resting on a washer E2, seated on the inside of the tire F, and a nut E3screws on the sleeve E and abuts against a washer E4, fitted on theoutside of the tireF opposite the washer E2. By

screwing up the nut E3 the sleeve E is secured to the tire E, the nutE3'tting in a corresponding recess in the rim G.

'Vithin the barrel A is arranged to reciprocate aplunger H of the usualcup form and secured on the outerend of a plunger-stem I extendingthrough the head D and sleeve E into the tire E, as shown in Figs. 1, 2,and 3. The plunger H is secured on the reduced end I of the stem I, andon this reduced portion is coiled a spring J, resting on a shoulderformed between the reduced portion and the main part of the stemI, saidspring serving to normally hold the plunger seated against the innerreduced end of the head D to close the ports ct bya washer I4, to limitthe move-- ment of the plunger, and to hold the end of the stein I thedesired distance in the tire F, as is plainly indicated in Figs. l and2. The inner end ofthe stem Iis provided with a button I2, adapted to beengaged by the wall of the tire E when the latter is deflated by reasonof a puncture or other cause, and the tire yields inward upon the pumpmoving into a lowermost position with the wheel, (see Fig. 3,) so thatthe stem I is forced inward, and with it the plunger H, to cause the aircon# tained in the inner portion of the barrel A to move past thecup-plunger H into the outer portion of the cylinder or barrel A, asindicated by the arrow in Eig. 3. When this movement takes place, thespring J is compressed, and when the pump moves out of a lowermostposition upon a further turning of the wheel of the vehicle then thespring imparts a return movement to the stem I and plunger H, so thatthe air in the outer portion of the cylinder vA is forced by theplunhead D and from the latter into the sleeveE and then through arecess I3 into the interior of the tire F to inflate the same. Therecess I3 extends from the shoulder of the stem I toward the button l2 adistance sufficient to establish communication at all times with theinterior of the tire F to allow the air to pass into the tire upon themovement of the IOO plunger H, as described. When the spring .I forcesthe stem I outward, then the plunger 1I sucks in air through the head Band the suction-valve C, and when the stem I,

with the plunger I-I, is again moved inward by the action of the tire F,as shown in Fig.

3, then the previously-drawn-in airis forced.. past the plunger H intothe outer end of thev cylinder A, and when the spring .I moves theplunger H back to its normal position (shown plunger to force the airinto the tire F. `,In order to permit adjustment of thepump to tires ofdifferent diameters, it isnecessaryv to screw the head I) on the sleeve,E such a distance as to `project ihebntton end of the stem'Ithe desireddistance into the tire F.

`When this adjustment has been made, the head D, and with it the barrelA, is looked in` position on the sleeve 'E by nuts K, one off f a barrelhaving an outer and an inner head,

whichis a jam-nut.

jInorder to insure ,proper guiding of the stern I, the reduced endthereof iits snugly in a corresponding bore in the end of the head D,thelarge bore of the head serving as a passage to cond uct the air from thecylinder by Way ot' the ports ato the interior of the' The suction-vvalve C is preferably in the form of a rubber` cup having a slit; but Ido not limit vmyselfV tablish .communication .between the barrel `On thethreaded inlet end Bof the head Bl screws a cap L, having an air-inletpassage; and a threaded end L2, for completely closing the .head B whenthe cap is screwed in a reverse position on the said head B. IVhen the`cap Lis removed from the threaded end B' sleeve E and to the recess I3.

to this particular construction.

of the head B, then the discharge end of an ordinary bicycle-pump can becoupled to the said head to fill the tire with air by the use ofsaidpump.

By the construction described a very effective ,pump is produced whichis not liable to get out of order and not liable to cause leakage of theair from the tire.

Having thus fully described my invention,

`suction-valve and the inner head is adjustably attached to said sleeve,the inner head projecting into the barrel and having an internal passagefor the air and ports leading from the passage through the inner end ofthe head into the barrel, a plunger operating in said barrel and adaptedto be seated on the inner end of said inner head, to limit the movementof the plunger and its stem in an outward direction, the stemof theplunger extendingthrongh the sleeve into thetire, and a spring pressingthe stem tohold the plunger normallyto its'seat in the said head, thesaid stemhaving its inner enlarged portion formed with alongitudinallyextending groove opening into the tire, as set forth.

2. `A pump for pneumatic tires, comprising a sleeve secured to the rimand tirecfa wheel,

of which the outer head contains an-air-snction valve and the inner headhas a threaded bore for screwing onsaid sleeve and a small bore for thepassage of the plunger-stem, the inner end of said head projecting intotherbarreland having ports leading to the threaded bore, a plunger insaid barrel and having its stem consisting of a grooved `portionopeninginto the tire and the bore of the sleeve, to es- IGE ORGE BLAIR STACY.

W'itnesses:

JOHN K. BERRY, FRANK H. .BETTAIR-

